Meet some of the bacteria that make up 90 per cent of the living cells in your body

Meet some of the bacteria that make up 90 per cent of the living cells in your
body. The human body is home to trillions of lifeforms, from rod-shaped
E.coli that use their three tails to swim vigorously up and down our guts,
to salmonella which are famous for food poisoning scares but can happily
live on our skin with no ill effects to us.

Computer artwork of bacteria (blue and green) on human skin. Many types of
bacteria are found on human skin, especially associated with sweat glands
and hair follicles. They usually cause no problems, although some can cause
acne. Bacteria usually only become a problem if they penetrate the skin, for
example through a wound or cut.